JP2017072078A - Work machine and engine device used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device of a work machine that can suppress overlapping of tubes around a carburetor and improve assemblability of the engine device.SOLUTION: An engine device 4 includes a separator 27 that suctions mixture fluid in which oil and air fuel mixture after entering a crank chamber 38 from a cylinder chamber 36 are mixed, and supplies a gas component obtained by subjecting the suctioned mixture fluid to liquid gas separation, to an air filter 21, the air separator formed separately from the air filter 21. A separation chamber 71 of the air filter 21 is formed in an engine body 25 by overlapping a cylinder part 33 and a crack case 32.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a work machine and an engine device used therefor.

In an engine device for a work machine, an air filter and a carburetor for generating a mixture of air and fuel are attached to the engine body, and the mixture is supplied from the carburetor attached to the engine body to an intake port of the engine body. ing.
In the engine body, for example, a rocker arm chamber is provided on a cylinder chamber in which a piston moves up and down and a combustion chamber connected to an intake port, and a valve drive mechanism that opens and closes an intake port and an exhaust port in the rocker arm chamber. Is placed. The oil passing through the crank chamber circulates in the rocker arm chamber, and the circulated oil lubricates the drive mechanism of the rocker arm chamber.
In this cylinder chamber, so-called blow-by gas is generated in which a small amount of fuel mixture passes by the piston and enters the crank chamber. This blow-by gas is mixed with oil in a crank chamber or the like. When the mixed fluid of fuel and oil passes through the intake passage and the side of the valve and enters the fuel chamber, there is a problem that white smoke and oil consumption increase. Further, since the fuel component and the oil are mixed, there is a possibility that the deterioration of the oil component is promoted.

  For this reason, in the engine device for a working machine, as disclosed in Patent Document 1, a separator is provided at the lower portion of the air filter. In this separator, the mixed fluid of blowby gas and oil generated in the rocker arm chamber is separated into gas and liquid, and the separated gas component (fuel component) is supplied again from the air filter to the engine body. Thus, the unburned fuel contained in the mixed fluid is burned in the engine body. The separated liquid component (oil component) is returned to the engine body.

JP2013-068119A

However, when the separator is provided integrally with the air filter as disclosed in Patent Document 1, a tube for a mixed fluid of blowby gas and oil that connects the rocker arm chamber of the engine body and the separator is connected from the engine body to the air filter. Need to be routed to. In the engine device of the working machine, since the carburetor, the air filter, and the like are attached to the engine body, the mixed fluid tube passes around the carburetor.
On the other hand, the carburetor includes a plurality of tubes such as a tube for supplying fuel from the tank to the carburetor, a tube for returning excess fuel from the carburetor to the tank, and a tube for a pulse passage for supplying the vaporizing pressure to the carburetor. Need to be concatenated.
As a result, the tube connected to the carburetor and the tube for the mixed fluid are overlapped and rubbed around the carburetor, and it takes time to install the tube, which deteriorates the assembly workability of the engine device.

  As described above, in the working machine and the engine device used therefor, it is required to suppress the overlapping of the tubes around the carburetor, thereby improving the assembly workability of the engine device.

  An engine device for a working machine according to the present invention has a first part and a second part that are overlapped with each other, and a cylinder chamber in which the piston moves up and down, and a piston inside the overlapped first part and second part An engine body in which a crank chamber in which a crankshaft rotating according to vertical movement of the engine is disposed, and an oil circulation system that circulates oil in at least the crank chamber, an air filter that sucks outside air into the engine body, and intake air A carburetor that generates a mixture of outside air and fuel that is supplied to the engine body, and an air filter are formed separately from the air filter, and a mixed fluid that mixes blowby gas and oil that enters the crank chamber from the cylinder chamber A separator that sucks and separates the mixed fluid into gas and liquid. The separator has a separation chamber formed in the engine body by superimposing the first part and the second part, and the gas component separated in the separation chamber is supplied to the air filter and separated. The liquid component separated in the chamber is returned to the oil circulation system through the engine body.

  Preferably, the separation chamber is formed using a recess formed in at least one of the first and second mating surfaces.

  Preferably, the first part is a cylinder part and the second part is a crankcase.

  Preferably, the engine body includes an oil case forming an oil storage chamber, a work hole communicating from the separation chamber to the oil storage chamber, a plug member removably attached to the work hole and closing the work hole, The separation chamber is preferably formed by the recess and the plug member.

  Preferably, the working hole opens to the mating surface of the crankcase, the plug member is detachably attached to the crankcase, and forms a part of the mating surface on the crankcase side. It is good that the holding member which hold | maintains is provided.

  Preferably, the liquid component formed in the cylinder portion and having an oil passage leading to the cylinder chamber is separated from the cylinder chamber in the internal space of the crank chamber and the cylinder chamber. It is good to be returned to.

  Preferably, the work hole is opened in a range from the position facing the oil passage to the separation chamber on the mating surface of the crankcase, and the plug member is attached to the work hole so that one of the mating surfaces of the crankcase is provided. It is good to constitute a part.

  Preferably, the engine body is formed on the cylinder chamber and is a part of an oil circulation system, and a rocker arm chamber in which oil is circulated, and a mixed fluid passage communicating from the rocker arm chamber to the separation chamber, The separator preferably sucks the mixed fluid from the rocker arm chamber through the mixed fluid passage.

  A working machine according to the present invention is a working machine having a long operating rod, a tool attached to one end of the operating rod, and an engine module attached to the other end of the operating rod. A cylinder chamber in which the piston moves up and down, a crank chamber in which a crankshaft that rotates according to the up-and-down movement of the piston is disposed, and An engine body in which an oil circulation system that circulates oil in at least the crank chamber is formed, an air filter that sucks outside air into the engine body, and a mixture of the sucked outside air and fuel is generated and supplied to the engine body The carburetor and air filter are formed separately, and the blow-by gas and oil that enter the crank chamber from the cylinder chamber Aspirated miscellaneous mixed fluid comprises a separator for gas-liquid separation, the mixed fluid. The separator has a separation chamber formed in the engine body by superimposing the first part and the second part, and the gas component separated in the separation chamber is supplied to the air filter and separated. The liquid component separated in the chamber is returned to the oil circulation system through the engine body.

In the present invention, the separator is formed separately from the air filter, and is formed integrally with the engine body. Therefore, even if a tube for supplying the passage of the mixed fluid of blowby gas and oil to the separator is routed from the crank chamber provided in the upper part of the engine body or the rocker arm chamber thereabove to the separator, the tube remains in the carburetor. You can avoid going around. As a result, multiple tubes such as a tube that supplies fuel from the tank to the carburetor, a tube that returns excess fuel from the carburetor to the tank, and a pulse passage tube that supplies pressure to vaporize the fuel to the carburetor. Are connected to each other, the tube connected to the carburetor and the mixed fluid tube do not overlap around the carburetor. Since the tubes overlap each other around the carburetor and become difficult to rub, the tube can be easily attached and the assembly workability of the engine device is improved.
In addition, the liquid component that has been gas-liquid separated in the separation chamber is returned to the oil circulation system through the engine body. Therefore, the tube for the return path becomes unnecessary. This also facilitates the tube mounting operation and improves the assembly workability of the engine device.
Further, if the separator is arranged at the boundary of the crankcase, even when the separated liquid oil leaks, the liquid oil flows into the crank chamber, so that oil leakage to the outside of the engine can be prevented.
In addition, since the separator is formed using two parts that are generally divided during engine maintenance, the maintainability can be improved.
In the present invention, a separator separation chamber is formed in the engine body by superimposing the cylinder portion and the crankcase using a first recess formed on at least one of the mating surfaces of the cylinder portion and the crankcase. Is done. Therefore, a structure for forming the separator can be easily formed on the cylinder part or the crankcase before assembly. Moreover, since the separator separation chamber is integrally provided in the engine body after assembly, the separator can be disposed near the center of gravity of the engine device, and the weight balance of the engine device can be improved.
Further, in the present invention, since the separator is formed separately from the air filter, the size of the air filter can be reduced, the overhang by the air filter can be suppressed, and the size of the engine device can be reduced. Moreover, even if the air filter is replaced according to the use environment and the service life, it is not necessary to replace the separator together with the air filter.

FIG. 1 is a perspective view of a brush cutter 1 according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram of the usage state of the brush cutter 1 of FIG. FIG. 3 is a longitudinal sectional view (left-right direction) of the engine module 4 of FIG. FIG. 4 is an explanatory diagram of the oil circulation system 50 of the engine body 25 of FIG. FIG. 5 is a left side view of the engine body 25 of FIG. 3 showing the arrangement of the separators 27 of FIG. 6 is a partially cutaway left side view of the engine body 25 of FIG. 3, showing the internal structure of the separator 27 of FIG. 7 is a partially cutaway rear view of the engine body 25 of FIG. 3 showing the internal structure of the separator 27 of FIG. FIG. 8 is an explanatory diagram showing the bottom surface (matching surface) of the cylinder portion 33 on which the separator 27 is provided. FIG. 9 is an explanatory view showing the upper surface (mating surface) of the crankcase 32 on which the separator 27 is provided. FIG. 10 is a partially cutaway rear view of the engine body 25 showing the internal structure of the separator 27 according to the second embodiment of the present invention. FIG. 11 is a partially cutaway rear view of the engine body 25 showing the internal structure of the separator 27 in the third embodiment of the present embodiment. FIG. 12 is a partially cutaway rear view of the engine body 25 showing the internal structure of the separator 27 according to the fourth embodiment of the present embodiment. FIG. 13 is a longitudinal sectional view (left-right direction) of the engine body 25 showing the arrangement of the separators 27 in the fifth embodiment of the present embodiment.

  Hereinafter, a working machine and an engine device according to an embodiment of the present embodiment will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a perspective view of a brush cutter 1 according to a first embodiment of the present invention. The brush cutter 1 is a working machine that cuts weeds and the like grown on the ground, and is an example of a working machine.
The brush cutter 1 in FIG. 1 includes, for example, an operating rod 2, a tool mounting portion 3, an engine module 4, a fixing portion 5, a vibration-proof housing 6, and a handle 7. The engine module 4 is an example of an engine device.

The operation rod 2 is formed of, for example, a long pipe member. The operating rod 2 may have a divided structure that connects a plurality of pipe members. A drive shaft (not shown) is disposed in the pipe member.
The tool mounting portion 3 is attached to one end of a long operation rod 2. The mounting unit 3 includes, for example, a tool chuck and a tool cover. For example, as shown in FIG. 2, a tool such as a cutting blade 8 is attached to the tool chuck in a replaceable manner. The tool cover is attached to the operation rod 2 and covers the rear side of the tool attached to the tool chuck.
The engine module 4 is attached to the other end of the long operation rod 2. The engine module 4 has a cover member 28, and members such as an engine main body 25 described later are accommodated in the cover member 28. A tool chuck of the tool mounting portion 3 is connected to one end of the drive shaft disposed in the operation rod 2. A crankshaft 37 of the engine body 25 is connected to the other end of the drive shaft via a clutch mechanism of the engine body 25. Thereby, the tool attached to the tool chuck can be rotationally driven by the driving force of the engine body 25.
The fixing portion 5 is attached to the substantially central portion of the operating rod 2 in the longitudinal direction.
The anti-vibration housing 6 has a hollow cylindrical shape. The vibration-proof housing 6 is positioned between the engine module 4 and the fixed portion 5 together with an elastic member (not shown) in a state where the operation rod is passed. By attaching the vibration-proof housing 6 in a state of floating from the operation rod 2 in this way, vibration of the engine body 25 is hardly transmitted to the vibration-proof housing 6 through the operation rod.
The handle 7 has, for example, a U-shaped handle bar and a grip. A central portion of the U-shaped handle bar is attached to the front side of the vibration-proof housing 6. Grips are attached to both ends of the U-shaped handlebar. Around the grip, operation members such as an accelerator lever and a switch for operating the brush cutter 1 are arranged.

FIG. 2 is an explanatory diagram of the usage state of the brush cutter 1 of FIG. In FIG. 2, the worker M is shown together with the brush cutter 1.
A hanger 9 is attached to the outer periphery of the vibration-proof housing 6 of the brush cutter 1. The hanger 9 is connected to the hanging tool 10. The worker M can suspend the brush cutter 1 from his / her shoulder by wearing the lifting tool 10.
When performing the cutting blade 8 operation, the worker M hangs the brush cutter 1 from the shoulder and holds the handle 7 with both hands. Then, the worker M holds the handle 7 so that the cutting blade 8 is slightly lifted from the ground, and moves forward while swinging the brush cutter 1 left and right, for example. Thereby, the grass growing on the ground in front of the worker M can be mowed.

FIG. 3 is a longitudinal sectional view (left-right direction) of the engine module 4 of FIG. Hereinafter, the top, bottom, left, and right front and rear are used with reference to FIG.
3 includes, for example, an air filter 21, a carburetor 22, an insulator 23, a tank 24, an engine body 25, a muffler 26, a separator 27, and a cover member 28 that covers these.

The engine body 25 includes an oil case 31, a crankcase 32 disposed on the oil case 31, a cylinder portion 33 disposed on the crankcase 32, and a cylinder head 34 disposed on the cylinder portion 33. .
In the engine body 25, for example, a cylinder chamber 36 in which a piston 35 moves up and down, a crank chamber 38 in which a crankshaft 37 is rotatably arranged, a combustion chamber 39 in which a mixture of air and gas is burned, and an intake valve 40 And a rocker arm chamber 42 in which a cam or the like for driving the exhaust valve 41 is disposed.
The cylinder chamber 36 is formed in the cylinder portion 33. The crank chamber 38 is formed by attaching the crankcase 32 under the cylinder portion 33. The combustion chamber 39 is formed by attaching the cylinder head 34 to the upper side of the cylinder portion 33. The cylinder chamber 36 and the combustion chamber 39 are partitioned by the piston 35. The cylinder chamber 36 and the crank chamber 38 form an integral internal space 43. The rocker arm chamber 42 is formed in the cylinder head 34 above the combustion chamber 39.

The tank 24 stores fuel such as gasoline and alcohol that can be combusted in the engine body 25.
The air filter 21 has an air filter 21 and removes dust and the like from the outside air.
The carburetor 22 has a venturi pipe that vaporizes fuel, and vaporizes the fuel into air in the venturi pipe to generate a mixture of fuel and air. The venturi pipe of the carburetor 22 communicates with the intake port 44 of the engine body 25 through the insulator 23.
The air filter 21 and the carburetor 22 are attached to the left side of the cylinder portion 33 of the engine body 25 via an insulator 23 for heat insulation. A tank 24 is attached to the lower side of the air filter 21, the carburetor 22 and the insulator 23. The carburetor 22 and the tank 24 are connected by a fuel supply tube (not shown) that supplies fuel from the tank 24 to the carburetor 22. The carburetor 22 may be connected to a pulse passage tube (not shown) for discharging the fuel supplied from the tank 24 to the venturi pipe. The other end of the pulse passage tube is connected to the cylinder chamber 36, the crank chamber 38, or the intake port 44 of the engine body 25.
As a result, the mixture of air and fuel is transferred from the carburetor 22 to the insulator 23 and the negative pressure when the piston 35 moves from top to bottom with the intake valve 40 open and the exhaust valve 41 closed in the engine body 25. It can be supplied to the combustion chamber 39 of the engine body 25 through the intake port 44.

  The muffler 26 is attached to the right side of the cylinder portion 33 of the engine body 25. The muffler 26 is connected to the exhaust port 45 of the engine body 25. The muffler 26 dilutes and cools the high-temperature combusted air-fuel mixture exhausted from the engine body 25 and discharges it as exhaust gas to the outside.

  As described above, in the engine module 4 of the brush cutter 1, the air filter 21, the carburetor 22, the insulator 23, and the muffler 26 are attached to the left and right of the cylinder portion 33 of the engine body 25.

FIG. 4 is an explanatory diagram of the oil circulation system 50 of the engine body 25 of FIG.
FIG. 4 shows an oil storage chamber 51, an internal space 43 including a crank chamber 38 and a cylinder chamber 36, a cam chamber 52, and a rocker arm chamber 42 as spaces for circulating oil. FIG. 4 shows the air filter 21 and the separator 27.

In the internal space 43, for example, a crankshaft 37, a balance weight 46, a connecting rod 47, and a piston 35 are arranged as movable parts.
In the cam chamber 52, for example, a gear 48 that rotates together with the crankshaft 37, a cam, and the like are disposed as movable parts.
In the rocker arm chamber 42, for example, an intake valve 40, an exhaust valve 41, a push rod, and the like are arranged as movable parts. The push rod pushes down the intake valve 40 and the exhaust valve 41 according to the rotation of the cam.
The oil storage chamber 51 is formed below the crankcase 32. Oil for lubricating the movable parts of the engine body 25 is accommodated in the oil storage chamber 51. The oil in the oil storage chamber 51 circulates through the internal space 43 including the crank chamber 38, the cam chamber 52, and the rocker arm chamber 42, and lubricates the movable parts of the engine body 25 disposed in these spaces.
The oil storage chamber 51 is connected to the cylinder chamber 36 of the engine body 25 by a first oil passage 53. The oil in the oil storage chamber 51 is sucked into the internal space 43 from the first oil passage 53 due to the negative pressure in the internal space 43 of the engine body 25 and flows into the crank chamber 38 of the internal space 43. In the crank chamber 38, oil mist is generated by the rotating balance weight 46 and the like. Further, the crankshaft and the like can be lubricated by the scattering of oil in the internal space 43.
The mist oil generated in the crank chamber 38 of the internal space 43 flows into the oil storage chamber 51 through the first one-way valve 54 and the second oil passage 55 due to the positive pressure in the internal space 43 of the engine body 25. Since the third oil passage 56 connects the oil storage chamber 51 and the cam chamber 52, the oil mist is supplied to the cam chamber 52 and lubricates the movable parts in the cam chamber 52.
The cam chamber 52 is connected to the rocker arm chamber 42 by a fourth oil passage 57. The oil mist in the cam chamber is supplied to the rocker arm chamber and lubricates the movable parts in the rocker arm chamber 42. The rocker arm chamber 42 is connected to the cylinder chamber 36 of the internal space 43 through the fifth oil passage 58, the separator 27, the sixth oil passage 59, and the first oil passage 53.
As described above, in the engine module 4 of the brush cutter 1, the oil in the oil storage chamber 51 is circulated through the internal space 43 (crank chamber 38), the cam chamber 52, and the rocker arm chamber 42 of the engine body 25. The movable part can be suitably lubricated.

Thus, when the cam chamber 52 and the rocker arm chamber 42 are connected to the crank chamber 38 and the oil in the crank chamber 38 is circulated to lubricate the cam chamber 52 and the rocker arm chamber 42, for example, the mixture in the combustion chamber 39 is mixed. A part leaks out as so-called blow-by gas from the combustion chamber 39 to the internal space 43 (crank chamber) through a gap around the piston 35 and mixes with mist oil in the crank chamber. This mixed fluid of oil mist and blow-by gas circulates to the cam chamber 52 and the rocker arm chamber 42. In particular, since the rocker arm chamber 42 is provided in the upper part of the engine body 25, the mixed fluid tends to accumulate. Since the unmixed fuel and oil are contained in the mixed fluid, white smoke is generated when it passes through the intake passage and enters the combustion chamber. Also, the oil consumption increases. Furthermore, since the fuel component and the oil are mixed, the deterioration of the oil component is promoted.
For this reason, in the engine module 4 of the conventional brush cutter, the fifth oil passage 58 is connected to the rocker arm chamber 42 at the lower part of the air filter 21 and the sixth oil passage 59 is connected to the cylinder chamber 36 of the engine body 25. The separator 27 is provided, and the mixed fluid is gas-liquid separated by the separator 27. The separated gas component (fuel component) can be returned to the air filter 21 integrated with the separator 27 through the gas return path 60, and can be supplied again from the air filter 21 to the combustion chamber 39 of the engine body 25. Can be burned. The separated liquid component (oil component) can be returned to the engine body 25 through the sixth oil path 59.

However, when the separator 27 is provided integrally with the air filter 21 as described above, the fifth oil passage 58 is connected to the separator 27 integrated with the air filter 21 and the rocker arm chamber 42 of the engine body 25. The mixed fluid tube needs to be routed from the upper part of the engine body 25 to the air filter 21.
In order to connect the separator 27 integrated with the air filter 21 and the cylinder chamber 36 of the engine body 25, an oil return tube for the sixth oil passage 59 is connected from the air filter 21 to the cylinder portion of the engine body 25. It is necessary to route to 33.
As a result, it is necessary to route the mixed fluid tube and the oil return tube in the engine module 4 of the brush cutter 1 where miniaturization is desired and the components are densely laid out. In the engine module 4 of the brush cutter 1, since the carburetor 22, the air filter 21, and the like are attached to the engine body 25, the mixed fluid tube passes around the carburetor 22 from the upper part of the engine body 25. Thus, the air filter 21 is connected to the separator 27.
Further, as described above, the carburetor 22 used in the engine module 4 of the brush cutter 1 needs to be connected with a plurality of tubes such as a fuel supply tube, a fuel return tube, and a pulse passage tube.
As a result, the plurality of tubes connected to the carburetor 22 and the mixed fluid tube overlap around the carburetor 22, and these tubes rub against each other around the carburetor 22. Assembling workability of 4 will deteriorate.
As described above, the brush cutter 1 and the engine module 4 used therein are required to improve the assembly workability of the engine module 4 by making it difficult for the tubes to overlap each other around the carburetor 22.
Therefore, in this embodiment, the separator 27 is formed separately from the air filter 21 and separated from the air filter 21. A separator 27 separated from the air filter 21 is integrally attached to the insulator 23 and provided closer to the engine body 25 than the carburetor 22. Thereby, the tube for the mixed fluid of blow-by gas and oil mist can be prevented from passing around the carburetor 22. This will be described in detail below.

FIG. 5 is a left side view of the engine body 25 of FIG. 3 showing the arrangement of the separators 27 of FIG.
6 is a partially cutaway left side view of the engine body 25 of FIG. 3, showing the internal structure of the separator 27 of FIG.
7 is a partially cutaway rear view of the engine body 25 of FIG. 3 showing the internal structure of the separator 27 of FIG.
As shown in FIGS. 5 to 7, the separator 27 is formed on the left side of the engine body 25. The separator 27 is formed so as to protrude into the separation chamber 71, a separation chamber 71 that sucks the mixed fluid and separates it into gas and liquid, a metal mesh 72 that is accommodated in the separation chamber 71 and gets wet with the liquid component in the mixed fluid. And an inner nozzle 73 that exhausts the separated gas component from the separation chamber 71. In these drawings, a discharge path 74 and a one-way valve 75 communicating with the lower part of the separation chamber 71 are shown.

FIG. 8 is an explanatory diagram showing the bottom surface (matching surface S33) of the cylinder portion 33 on which the separator 27 is provided. The cylinder portion 33 is overlapped with the crankcase 32 on the bottom surface of FIG.
In the cylinder portion 33, a separator hole 81, a first recess 82, a second recess 83, and a return hole 84 that are part of the separation chamber 71 are formed on the left side of the hole 85 for the crank chamber 38.
The separator hole 81 has a substantially cubic hole shape. The separator hole 81 is formed at a position separated from the hole on the left side of the hole 85 for the crank chamber 38. The separator hole 81 forms a substantially rectangular opening at a position on the left side of the crank chamber 38 on the mating surface S33 of the cylinder portion 33.
The first recess 82 and the second recess 83 are shallow depressions formed in the mating surface S33 of the cylinder portion 33. The first recess 82 and the second recess 83 are formed continuously with the separator hole 81 on the right side between the separator hole 81 and the hole 85 for the crank chamber 38. The first recess 82 is continuous with the separator hole 81 on the front side of the engine body 25. The second recess 83 is continuous with the separator hole 81 on the rear side of the engine body 25. The first recess 82 and the second recess 83 form a shallow recess that continues from the separator hole 81 toward the inside of the engine body 25.
As shown in FIG. 7, the return hole 84 extends in the vertical direction and is connected to the first oil passage 53 in the cylinder portion 33. The return hole 84 may be connected to a pulse passage for transmitting the pressure in the cylinder chamber 36 to the carburetor 22. The return hole 84 forms an opening at a position between the first recess 82 and the second recess 83 on the mating surface S33 of the cylinder portion 33.

FIG. 9 is an explanatory view showing the upper surface (matching surface S32) of the crankcase 32 on which the separator 27 is provided. The crankcase 32 is overlapped with the cylinder portion 33 on the upper surface of FIG.
In the crankcase 32, a first sink 91 and a second sink 92 that form the bottom of the separation chamber 71 are formed on the left side of the hole 93 for the crank chamber 38.
The first sink 91 is a substantially rectangular shallow depression formed on the mating surface S32 of the crankcase 32. The first sink 91 is formed in a range corresponding to the separator hole 81, the first concave portion 82, and the second concave portion 83 of the cylinder portion 33 at a spaced position on the left side of the crank chamber 38.
The second sink 92 is a substantially rectangular shallow depression formed in the first sink 91. The second sink 92 is formed in a corresponding range between the first recess 82 and the second recess 83. The portion where the second sink 92 is formed is deeper than the portion where the first sink 91 is formed.
By forming the second sink 92, the first sink 91 has a substantially U-shaped bottom surface. A plurality of ridges 94 are formed on the bottom surface of the substantially U-shaped first sink 91. The ridge 94 extends in the left-right direction. In FIG. 9, six ridges 94 are formed side by side in the front-rear direction.

The bottom surface of the cylinder part 33 in FIG. 8 and the top surface of the crankcase 32 in FIG. 9 are overlapped. Thereby, the cylinder part 33 and the crankcase 32 are assembled. That is, the engine body 25 is assembled.
A separation chamber 71 shown in FIGS. 5 to 7 is defined on the left side of the crank chamber 38 on the mating surfaces S33 and S32 of the cylinder portion 33 and the crankcase 32. The separation chamber 71 is formed in a vertically long, substantially cubic hollow shape by the separator hole 81 and the left portion of the first sink 91.
On the right side of the separation chamber 71, a liquid component discharge path 74 communicating with the lower portion of the separation chamber 71 is formed. The discharge path 74 is a passage formed by the right portion of the first sink 91, the second sink 92, the first recess 82, and the second recess 83.
A return hole 84 communicates with the discharge path 74. The return hole 84 communicates with the discharge path 74 at a position facing the second sink 92.
As shown in FIG. 7, the return hole 84 extends upward from the mating surfaces S <b> 33 and S <b> 32 between the cylinder portion 33 and the crankcase 32 in the engine body 25. The upper end of the return hole 84 communicates with the first oil passage 53 in the cylinder portion 33.
As a result, a liquid component passage communicating from the separation chamber 71 to the cylinder chamber 36 of the engine body 25 is formed. In FIG. 4, a sixth oil passage 59 for returning the liquid component after gas-liquid separation from the separation chamber 71 to the cylinder chamber 36 is formed. A one-way valve 75 is disposed in the return hole 84 in order to prevent the liquid component from returning to the separation chamber 71.
Here, the sixth oil passage 59 is directed from the separation chamber 71 toward the inside of the engine body 25 by the discharge passage 74. Therefore, although the separation chamber 71 is formed on the mating surfaces S33 and S32 between the cylinder portion 33 and the crankcase 32, the liquid component separated in the separation chamber 71 is separated from the separation chamber 71 into the engine body 25. It is possible to prevent leakage to the outside.
A plurality of ridges 94 are formed extending in the left-right direction from the bottom surface of the separation chamber 71 to the discharge path 74. Accordingly, the liquid component easily flows from the separation chamber 71 toward the second sink 92 along the plurality of ridges 94. The liquid component separated in the separation chamber 71 is smoothly discharged from the separation chamber 71 and collected in the second sink 92 below the return hole 84.

  As shown in FIGS. 5 to 7, a suction hole 76 is opened at the center position of the vertically long substantially cubic separation chamber 71. A tube for a mixed fluid of blowby gas and mist oil connected to the rocker arm chamber 42 is connected to the suction hole 76. As a result, a fifth oil passage 58 for drawing the mixed fluid from the rocker arm chamber 42 to the separation chamber 71 in FIG. 4 is formed. A tube for the sixth oil passage 59 in FIG. 4 is not necessary.

  The mesh 72 may be, for example, a wire-like metal wire rounded into a gold scissors shape. As shown in FIG. 7, the mesh 72 is disposed in the separation chamber 71. The mesh 72 is formed in a substantially donut-shaped outer shape, and has a through hole 77 in the center thereof. Thereby, in a state where the mesh 72 is placed in the separation chamber 71, a space portion without the mesh 72 is formed in the front portion of the suction hole 76. The mixed fluid drawn into the separation chamber 71 from the suction hole 76 can easily enter the separation chamber 71. Even if the mesh 72 is wetted by a separation component such as oil, a space for drawing the mixed fluid in front of the suction hole 76 can be secured.

  The inner nozzle 73 is provided above the mesh 72 and above the separation chamber 71 having a vertically long and substantially cubic shape. The inner nozzle 73 protrudes into the separation chamber 71 at a position above the suction hole 76. A tube connected to the air filter 21 is connected to the inner nozzle 73. Thereby, in FIG. 4, the gas return path 60 which returns the gas component after gas-liquid separation to the air filter 21 is formed. Further, since the inner nozzle 73 protrudes into the separation chamber 71, a creeping distance from the suction hole 76 to the tip of the inner nozzle 73 can be earned. Coupled with the arrangement of the inner nozzle 73 above the suction hole 76, it becomes difficult for liquid components such as separated oil to enter the inner nozzle 73.

In such a separator 27, for example, when the cylinder moves from bottom to top in the cylinder chamber 36 and the cylinder chamber 36 and the crank chamber 38 have negative pressure, the first oil path 53, the return hole 84, and the discharge path A negative pressure acts on the separation chamber 71 through 74. Due to the negative pressure in the separation chamber 71, the mixed fluid of blowby gas and mist oil accumulated in the rocker arm chamber 42 is sucked into the separation chamber 71 through the suction hole 76.
The mixed fluid of blow-by gas and mist oil sucked into the separation chamber 71 touches the mesh 72 in the separation chamber 71 and wets the mesh 72. Thereby, the gas component (fuel component) and liquid component (oil component) in the mixed fluid are separated.
Next, when a negative pressure acts on the separation chamber 71, the gas component in the separation chamber 71 is returned to the air filter 21 through the inner nozzle 73 and the gas return path 60 formed by a tube. The separated gas component is drawn into the combustion chamber 39 of the engine body 25 from the air filter 21 and burned.
Further, when a negative pressure is applied to the separation chamber 71, the separated liquid component flows from the separation chamber 71 into the cylinder chamber 36 through the discharge path 74, the return hole 84, and the first oil path 53.
As described above, the separator 27 can separate the gas component and the liquid component in the mixed fluid and return them to the air filter 21 or the internal space 43 of the engine body 25.
The first oil passage 53 communicates with the cylinder chamber 36. Therefore, when the piston 35 descends and the cylinder chamber 36 and the crank chamber 38 become positive pressure, the first oil passage 53 is blocked by the cylinder. A high positive pressure does not act on the separation chamber 71. As a result, although the separation chamber 71 is formed on the mating surfaces S33 and S32 between the cylinder portion 33 and the crankcase 32, the liquid components separated in the separation chamber 71 from the separation chamber 71 are separated from the engine body 25. It becomes difficult to seep out toward the outside.

In the present embodiment, as shown in FIG. 5, the mixed fluid tube can be routed closer to the engine body 25 than the insulator 23. Therefore, the mixed fluid tube can be routed so as not to overlap the tube connected to the carburetor 22.
In the present embodiment, as shown in FIG. 5, the gas component tube can be routed so as to pass under the carburetor 22. Therefore, the gas component tube can be routed so as not to overlap the tube connected to the carburetor 22.

As described above, in this embodiment, the separator 27 is formed separately from the air filter 21 and is formed integrally with the engine body 25. Therefore, even if the tube for supplying the passage of the mixed fluid of blowby gas and oil to the separator 27 is routed from the crank chamber 38 provided in the upper part of the engine body 25 or the rocker arm chamber 42 thereon to the separator 27, for example, The tube can be prevented from passing around the carburetor 22. As a result, for example, a tube for supplying fuel to the carburetor 22 from the tank 24 to the carburetor 22, a tube for returning excess fuel from the carburetor 22 to the tank 24, and a pulse passage for supplying pressure for vaporizing the fuel to the carburetor 22. Even if a plurality of tubes such as tubes are connected, the tube connected to the carburetor 22 and the mixed fluid tube do not overlap around the carburetor 22. Since the tubes overlap each other around the carburetor 22 and are difficult to rub, the tube mounting operation is facilitated, and the assembly workability of the engine module 4 is improved.
In addition, the liquid component that has been gas-liquid separated in the separation chamber 71 is returned to the oil circulation system through the engine body 25. Therefore, the tube for the return path becomes unnecessary. This also facilitates the tube mounting operation and improves the assembly workability of the engine module 4.
In addition, since the separator 27 is disposed at the boundary of the crankcase 32, the liquid oil flows into the crank chamber 38 even when the separated liquid oil leaks, so that the oil leaks to the outside of the engine body 25. Can be prevented.
Further, since the separator 27 is formed by using the cylinder part 33 and the crankcase 32 (which is correct?) That are generally divided into two parts at the time of engine maintenance, the maintainability can be improved. .
In the present embodiment, the cylinder portion 33 and the crankcase 32 are overlapped with each other using the first recess 82 formed in at least one of the mating surfaces S32 and S33 of the cylinder portion 33 and the crankcase 32. A separation chamber 71 for the separator 27 is formed in the main body 25. Therefore, a structure for forming the separator 27 can be easily formed in the cylinder part 33 or the crankcase 32 before assembly. Moreover, since the separation chamber 71 of the separator 27 is integrally provided in the engine body 25 after assembly, the separator 27 can be disposed near the center of gravity of the engine module 4 and the weight balance of the engine module 4 can be improved.
In the present embodiment, since the separator 27 is formed separately from the air filter 21, the size of the air filter 21 can be reduced, the overhang by the air filter 21 can be suppressed, and the size of the engine module 4 can be reduced. Can be made compact. Moreover, even if the air filter 21 is replaced according to the use environment and the service life, it is not necessary to replace the separator 27 together with the air filter 21.
Further, since the separator 27 is provided below the plurality of air cooling fins 49 in the engine main body 25, the air cooling performance of the engine main body 25 by the plurality of air cooling fins 49 is not impaired. Further, by arranging the separator 27 below the plurality of air-cooling fins 49, heat is hardly transmitted to the separator 27 even though the separator 27 is formed integrally with the engine body 25. The gas-liquid separation performance in the separator 27 can be improved by suppressing the temperature of the mixed fluid and increasing the viscosity of the oil component.
On the other hand, for example, when the separator 27 is attached to the upper side of the engine body 25 next to the plurality of air-cooling fins 49, for example, the temperature of the mixed fluid in the separator 27 is difficult to decrease.

  In the present embodiment, the separation chamber 71 of the separator 27 passes through a discharge path 74 formed on the mating surfaces S33 and S32 of the cylinder portion 33 and the crankcase 32, and a discharge path 74 extending upward from the discharge path 74. The cylinder chamber 36 communicates with the crank chamber 38 and the cylinder chamber 36 in the internal space 43. The separation chamber 71 of the separator 27 is not directly connected to the crank chamber 38. In the engine device of the brush cutter 1 used in various postures, it is desired to maintain the crank chamber 38 in a predetermined negative pressure state for oil circulation or the like. The outside air can hardly flow through the separator 27. For example, the pressure of the crank chamber 38 decreases when the piston 35 rises, and the oil passage leading to the cylinder chamber 36 at that time can be closed by the piston 35 that rises. A high negative pressure can be obtained in the crank chamber 38. The liquid component separated by the separator 27 can be returned to the internal space 43 of the engine body 25 without impairing the circulation performance of the oil circulated by the negative pressure.

[Second Embodiment]
The brush cutter 1 of the second embodiment of the present invention is different from that of the first embodiment in that a work hole 101 for accessing the separation chamber 71 of the separator 27 is provided. In the second embodiment, the same names and symbols are used for the same components as in the first embodiment, and the description thereof is omitted. Hereinafter, the difference will be mainly described.

FIG. 10 is a partially cutaway rear view of the engine body 25 showing the internal structure of the separator 27 according to the second embodiment of the present invention.
In the engine body 25 of FIG. 10, the work hole 101 is formed in the crankcase 32. The work hole 101 is formed in a range extending from the first sink 91 to the second sink 92. The working hole 101 is formed downward from the mating surface S32 with the cylinder part 33. The working hole 101 communicates the separation chamber 71 of the separator 27 and the oil storage chamber 51.
A plug member 102 is detachably inserted into the working hole 101. FIG. 10 shows a state where the plug member 102 is removed from the work hole 101.
By inserting the plug member 102 into the work hole 101, the work hole 101 is closed. The separation chamber 71 of the separator 27 and the oil storage chamber 51 can be separated. Further, the upper surface of the plug member 102 is formed in the same shape as the first sink 91 and the second sink 92 of the first embodiment.

As described above, in the present embodiment, in the present invention, the oil case 31 that forms the oil storage chamber 51 outside the crank chamber 38 is removed from the crank case 32, and the plug member 102 is removed from the work hole 101. The person M can access the separation chamber 71 of the separator 27 formed on the mating surfaces S33 and S32 of the cylinder portion 33 and the crankcase 32. Maintenance of the separator 27 can be performed without disassembling the cylinder part 33 and the crankcase 32. For example, dust collected in the separation chamber 71 of the separator 27 can be removed, or the mesh 72 disposed in the separation chamber 71 of the separator 27 can be replaced or cleaned.
The mating surfaces S33 and S32 of the cylinder part 33 and the crankcase 32 where the separator 27 is formed are firmly fixed to each other so as to sandwich the crankshaft 37 between them in a rotatable manner. However, the separator 27 formed on the mating surfaces S33 and S32 can be easily maintained without disassembling the cylinder part 33 and the crankcase 32.
The work hole 101 does not open to the outer surface of the engine body 25 but opens to the oil storage chamber 51 covered with the oil case 31. Therefore, even if the liquid component separated in the separation chamber 71 of the separator 27 leaks from the work hole 101, the leaked liquid component does not ooze out to the outer surface of the engine body 25 and falls to the oil storage chamber 51.

  In the present embodiment, the work hole 101 is formed in a range corresponding to the first sink 91 and the second sink 92 on the mating surface S32 of the crankcase 32. That is, the working hole 101 is formed in a range from a position where the separator 27 communicates with the separation chamber 71 to a position facing the oil passage. Therefore, not only the separator 27 but also the discharge path 74 and the return hole 84 following the separator 27 can be easily maintained. In order to transmit the pressure in the internal space 43, the discharge path 74 and the return hole 84 from the separator 27 to the crank chamber 38 are formed with a small cross-sectional area, but it is easy to remove dust clogged in the small oil flow path. Can be removed.

[Third Embodiment]
The brush cutter 1 according to the third embodiment of the present invention is the same as that of the second embodiment in that the plug member 102 and the holding member 103 are used to close the working hole 101 for accessing the separation chamber 71 of the separator 27. And different. In the third embodiment, the same names and symbols are used for the same components as in the second embodiment, and the description thereof is omitted. Hereinafter, the difference will be mainly described.

FIG. 11 is a partially cutaway rear view of the engine body 25 showing the internal structure of the separator 27 in the third embodiment of the present embodiment.
In the engine main body 25 of FIG. 11, the plug member 102 inserted into the work hole 101 is suppressed from below by the holding member 103.
The holding member 103 is fixed to the crankcase 32 using, for example, screws.

As described above, in this embodiment, the holding member 103 can hold the plug member 102 so that the plug member 102 forms the mating surface S32 on the crankcase 32 side together with the crankcase 32. Therefore, the separation chamber 71 of the separator 27 formed on the mating surfaces S33 and S32 between the crankcase 32 and the cylinder portion 33 and communicating with the work hole 101 is formed into a desired shape in which the work hole 101 is not exposed. Is possible.
The stopper member 102 is made of, for example, a metal material that can obtain the accuracy required for the mating surface S32 with the crankcase 32, and the holding member 103 is made of, for example, a resin material that holds the stopper member 102. Can be used. Further, by using, for example, a resin material for the holding member 103, even if a gap through which oil can pass is left between the work hole 101 and the plug member 102, the gap can be suitably closed by the holding member 103. .

[Fourth Embodiment]
The brush cutter 1 according to the fourth embodiment of the present invention is different from that of the first embodiment in that a fifth oil passage 58 that connects the rocker arm chamber 42 and the separator 27 in FIG. Different from the one. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same names and symbols, and the description thereof is omitted. Hereinafter, the difference will be mainly described.

FIG. 12 is a partially cutaway rear view of the engine body 25 showing the internal structure of the separator 27 according to the fourth embodiment of the present embodiment.
A mixed fluid passage 104 is formed in the engine body 25. The mixed fluid passage 104 extends in the vertical direction from the rocker arm chamber 42 of the engine body 25 to the separation chamber 71 of the separator 27. Note that the lower end of the mixed fluid passage 104 opens at the center in the vertical direction.

As described above, in the present embodiment, since the mixed fluid passage is formed integrally with the engine body 25, the mixed fluid tube for connecting the rocker arm chamber 42 and the separator 27 in FIG. There is no need to provide the engine body 25 separately. The mixed fluid tube can be eliminated from around the carburetor 22.
Here, the features of the fourth embodiment are applied to the first embodiment, but may be applied to the second embodiment, the third embodiment, or a fifth embodiment to be described later.

[Fifth Embodiment]
The brush cutter 1 according to the fifth embodiment of the present invention is different from that of the first embodiment in the posture of the separator 27 integrated with the engine body 25. In the fifth embodiment, the same names and symbols are used for the same components as in the first embodiment, and the description thereof is omitted. Hereinafter, the difference will be mainly described.

FIG. 13 is a longitudinal sectional view (left-right direction) of the engine body 25 showing the arrangement of the separators 27 in the fifth embodiment of the present embodiment.
The engine main body 25 includes an oil case 31, a crankcase 32, a cylinder part 33, and a cylinder head 34. The cylinder chamber 36 is formed in the cylinder portion 33. The crank chamber 38 is formed by the cylinder portion 33 and the crankcase 32. The oil storage chamber 51 is formed by the oil case 31 and the crankcase 32.
The separator 27 is formed on the mating surfaces S33 and S32 between the crankcase 32 and the cylinder part 33. In FIG. 14, a separator 27 integrated with the engine body 25 is formed on the left side of the crank chamber 38.
Specifically, the separation chamber 71 of the separator 27 is formed integrally with the crankcase 32 on the mating surface S33 with the crankcase 32. By separating the cylinder portion 33 from the crankcase 32, a separation chamber 71 is defined.
In addition, a discharge path 74 is formed under the separation chamber 71. The discharge path 74 is connected to the crank chamber 38 from the bottom surface of the separation chamber 71.

As described above, in the present embodiment, since the separator 27 is formed on the mating surfaces S33 and S32 between the crankcase 32 and the cylinder portion 33, the separator 27 is formed integrally with the engine body 25. According to this, since the separator 27 can be formed together only by assembling the engine body 25, the assembling work is also facilitated.
The mixed fluid tube connecting the rocker arm chamber 42 of the engine body 25 and the separator 27 can be separated from the carburetor 22 toward the engine body 25 and passed from the top to the bottom around the insulator 23. As a result, the mixed fluid tube does not overlap the various tubes connected to the carburetor 22 around the carburetor 22. The tube mounting operation is facilitated, and the assembly workability of the engine module 4 is improved.
Further, since the separator 27 is provided below the plurality of air cooling fins 49 in the engine main body 25, the air cooling performance of the engine main body 25 by the plurality of air cooling fins 49 is not impaired. Further, by arranging the separator 27 below the plurality of air-cooling fins 49, heat is hardly transmitted to the separator 27 even though the separator 27 is formed integrally with the engine body 25. The gas-liquid separation performance in the separator 27 can be improved by suppressing the temperature of the mixed fluid and increasing the viscosity of the oil component.
On the other hand, for example, when the separator 27 is attached to the upper side of the engine body 25 next to the plurality of air-cooling fins 49, for example, the temperature of the mixed fluid in the separator 27 is difficult to decrease.

  In the present embodiment, since the separator 27 is formed integrally with the engine body 25, a tube for connecting the separator 27 and the engine body 25 becomes unnecessary. Moreover, since the pressure fluctuation in the cylinder chamber 36 or the crank chamber 38 of the engine body 25 directly acts on the separator 27, pressure loss due to a flexible tube or the like is eliminated, and the gas-liquid separation performance of the separator 27 can be improved. .

  The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications or changes can be made without departing from the scope of the invention.

  For example, in the above embodiment, the mesh 72 is disposed in the separation chamber 71 of the separator 27. In addition to this, for example, an inner case may be disposed in the separation chamber 71 and the mesh 72 may be disposed in the inner case. Further, the inner case may be provided with various liquid passages for drawing the liquid component in the separation chamber 71 to the discharge passage 74 when the engine body 25 is inclined.

In the above embodiment, since only the crankcase 32 is overlapped with the cylinder portion 33, the insulator 23 is formed on the mating surfaces S33 and S32.
In addition, for example, when the cylinder portion 33 and the oil case 31 are overlapped, the insulator 23 may be formed on the mating surfaces S33 and S32.

In the above embodiment, the separator 27 supplies the gas component separated from the gas and liquid to the air filter 21 and returns the liquid component separated from the gas and liquid to the internal space 43 of the engine body 25.
In addition to this, for example, the separator 27 may return the liquid component subjected to gas-liquid separation to the oil storage chamber 51 of the engine body 25. Furthermore, for example, the chamber may be returned to a chamber in which parts that require oil lubrication, such as the rocker arm chamber 42, are arranged. By returning the liquid component after the gas-liquid separation to the oil circulation system 50, the oil can be reused and the consumption of the oil can be suppressed.

The above embodiment is an example in which the present invention is applied to the brush cutter 1.
Other work machines include, for example, a pole saw, a pole hedge trimmer, and a coffee harvester. The present invention can be used when the engine module 4 is used in these working machines. The working machine may be a stationary type used for a generator or the like.
In the above embodiment, an example in which the first part is a cylinder part and the second part is a crankcase is shown, but the first part may be a cylinder part and the second part may be an oil case. The first part may be a crankcase and the second part may be an oil case.
The cylinder portion of the present application is one part that forms the periphery of the cylinder (cylinder chamber) and the upper half of the crank chamber, but the portion that covers the periphery of the cylinder and the portion that forms the upper half of the crank chamber are It may be a separate part. In this case, the first part may be a part that covers the periphery of the cylinder, and the second part may be a part that forms the upper half of the crank chamber.
In the above embodiment, an example in which a mesh filter is arranged in the separator has been shown, but as a filter, the passage has a labyrinth shape, a filter structure that separates liquid oil by contact between a gas containing oil mist and a wall, Various modifications such as a filter structure for separating liquid oil by centrifugal force can be made.
In the said embodiment, although the mesh showed the example of a donut type, the shape of a mesh can be changed variously and there may be no center hole.

DESCRIPTION OF SYMBOLS 1 Brush cutter (work machine), 2 operation rod, 4 Engine module (engine apparatus), 8 Cutting blade (tool), 21 Air filter, 22 Carburetor, 25 Engine main body, 27 Separator, 28 Cover member, 31 Oil case, 32 Crankcase, S32 mating surface, 33 cylinder part, S33 mating surface, 35 piston, 36 cylinder chamber, 37 crankshaft, 38 crank chamber, 42 rocker arm chamber, 43 internal space, 50 oil circulation system, 51 oil storage chamber, 71 Separation chamber, 74 discharge path, 81 separator hole (recess for separator), 82 first recess (discharge recess), 83 second recess (discharge recess), 84 return hole (oil path), 91 1st Sink (recessed part for separator, recessed part for discharge), 92 second sink (recessed part for discharge), 101 working hole, 10 2 Plug member, 103 Holding member, 104 Mixed fluid passage

Claims (9)

A cylinder chamber in which the piston moves up and down and a crankshaft that rotates in accordance with the up-and-down movement of the piston are disposed inside the first and second parts that are overlapped with each other. An engine main body formed with a crank chamber and an oil circulation system for circulating oil at least in the crank chamber;
An air filter for taking outside air into the engine body;
A carburetor that generates an air-fuel mixture of the intake air and fuel and supplies the mixture to the engine body;
A separator that is formed separately from the air filter, sucks a mixed fluid in which the blowby gas that has entered the crank chamber from the cylinder chamber and the oil are mixed, and gas-liquid separates the mixed fluid;
Have
The separator has a separation chamber formed in the engine body by superimposing the first part and the second part;
The gas component separated in the separation chamber is supplied to the air filter, and the liquid component separated in the separation chamber is returned to the oil circulation system through the engine body.
Engine device for work equipment. The separation chamber is formed by using a recess formed in at least one of the first part mating surface and the second part mating surface.
The engine device for a working machine according to claim 1. The first part is a cylinder part and the second part is a crankcase;
The engine device for a working machine according to claim 2. The engine body is
An oil case forming an oil storage chamber;
A working hole communicating from the separation chamber to the oil storage chamber;
A plug member that is detachably attached to the working hole and closes the working hole;
Have
The separation chamber is formed by the recess and the plug member.
The engine device for a working machine according to claim 3. The working hole opens in the mating surface of the crankcase,
The plug member is detachably attached to the crankcase,
A holding member for holding the plug member so as to constitute a part of the mating surface on the crankcase side is provided;
The engine device for a working machine according to claim 4. An oil passage formed in the cylinder portion and leading to the cylinder chamber;
The liquid component separated into gas and liquid in the separation chamber is returned from the cylinder chamber to the oil circulation system in the internal space of the crank chamber and the cylinder chamber.
The engine device for a working machine according to claim 5. The working hole opens in a range from the position facing the oil passage to the separation chamber on the mating surface of the crankcase,
The plug member constitutes a part of a mating surface of the crankcase by being attached to the working hole.
The engine device for a working machine according to claim 6. The engine body is
A rocker arm chamber formed on the cylinder chamber and part of the oil circulation system, in which the oil is circulated;
A passage of the mixed fluid communicating from the rocker arm chamber to the separation chamber;
Have
The separator sucks the mixed fluid from the rocker arm chamber through the mixed fluid passage.
The engine device for a working machine according to any one of claims 1 to 7. In a working machine having a long operating rod, a tool attached to one end of the operating rod, and an engine module attached to the other end of the operating rod,
The engine module is
A cylinder chamber in which the piston moves up and down and a crankshaft that rotates in accordance with the up-and-down movement of the piston are disposed inside the first and second parts that are overlapped with each other. An engine main body formed with a crank chamber and an oil circulation system for circulating oil at least in the crank chamber;
An air filter for taking outside air into the engine body;
A carburetor that generates an air-fuel mixture of the intake air and fuel and supplies the mixture to the engine body;
A separator that is formed separately from the air filter, sucks a mixed fluid in which the blowby gas that has entered the crank chamber from the cylinder chamber and the oil are mixed, and gas-liquid separates the mixed fluid;
Have
The separator has a separation chamber formed in the engine body by superimposing the first part and the second part;
The gas component separated in the separation chamber is supplied to the air filter, and the liquid component separated in the separation chamber is returned to the oil circulation system through the engine body.
Work machine.

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